Jut got my clausing 12x36 up and running. Using machmotion breakout board and teco ac servo drives and a homemade tool turret. Machmotion does not support threading with their apollo I breakout board. I figured it was just a timing issue. I can cut a thread and it looks beautiful and the tool starts exactly the same on every pass. i mean the thread looks great. the problem is that the pitch is off. If i program a 20tpi, if i hold a tap up to it, the pitch is off considerably. My rpm is stable at 310 and drops to 308 for the first two or three passes then it is stable at 310 again. If i cut male and female threads , they fit good, so it is not a consistency issue. I messed with the debounce with no luck. i don't think it is the problem. I have spindle speed averaging checked. i also double checked the steps per for z axis. Anyone else have a similar problem? I'm running out of ideas.